Al-Biruni in the context of "Khwarazm"

Historically, Iran was commonly referred to as "Persia" in the Western world. Likewise, the modern-day ethnonym "Persian" was typically used as a demonym for all Iranian nationals, regardless of whether or not they were ethnic Persians. This terminology prevailed until 1935, when, during an international gathering for Nowruz, the Iranian king Reza Shah Pahlavi officially requested that foreign delegates begin using the endonym "Iran" in formal correspondence. Subsequently, "Iran" and "Iranian" were standardized as the terms referring to the country and its citizens, respectively. Later, in 1959, Pahlavi's son Mohammad Reza Pahlavi announced that it was appropriate to use both "Persia" and "Iran" in formal correspondence. A variety of scholars from the Middle Ages, such as the Khwarazmian polymath Al-Biruni, also used terms like "Xuniras" (Avestan: Xvaniraθa-, transl. "self-made, not resting on anything else") to refer to Iran: "which is the center of the world, [...] and it is the one wherein we are, and the kings called it the Iranian realm."

Science in the medieval Islamic world was the science developed and practised during the Islamic Golden Age under the Abbasid Caliphate of Baghdad, the Umayyads of Córdoba, the Abbadids of Seville, the Samanids, the Ziyarids and the Buyids in Persia and beyond, spanning the period roughly between 786 and 1258. Islamic scientific achievements encompassed a wide range of subject areas, especially astronomy, mathematics, and medicine. Other subjects of scientific inquiry included alchemy and chemistry, botany and agronomy, geography and cartography, ophthalmology, pharmacology, physics, and zoology.

Medieval Islamic science had practical purposes as well as the goal of understanding. For example, astronomy was useful for determining the Qibla, the direction in which to pray, botany had practical application in agriculture, as in the works of Ibn Bassal and Ibn al-'Awwam, and geography enabled Abu Zayd al-Balkhi to make accurate maps. Islamic mathematicians such as Al-Khwarizmi, Avicenna and Jamshīd al-Kāshī made advances in algebra, trigonometry, geometry and Arabic numerals. Islamic doctors described diseases like smallpox and measles, and challenged classical Greek medical theory. Al-Biruni, Avicenna and others described the preparation of hundreds of drugs made from medicinal plants and chemical compounds. Islamic physicists such as Ibn Al-Haytham, Al-Bīrūnī and others studied optics and mechanics as well as astronomy, and criticised Aristotle's view of motion.

Khwārezmian (Khwarezmian: زڨاک ای خوارزم zəβāg ī xwārazm, *xwārazmānk; also transliterated Khwarazmian, Chorasmian, Khorezmian) is an extinct Eastern Iranian language closely related to Sogdian. The language was spoken in the area of Khwarezm (Chorasmia), centered in the lower Amu Darya south of the Aral Sea (the northern part of the modern Republic of Uzbekistan and the adjacent areas of Kazakhstan and Turkmenistan).

Knowledge of Khwarezmian is limited to its Middle Iranian stage and, as with Sogdian, little is known of its ancient form. Based on the writings of Khwarezmian scholars Al-Biruni and Zamakhshari, the language was in use at least until the 13th century, when it was gradually replaced by Persian for the most part, as well as several dialects of Turkic.

Abu al-Qasim Mahmud ibn Sabuktigin (Persian: ابوالقاسم محمود بن سبکتگین, romanized: Abu al-Qāṣim Maḥmūd ibn Sabuktigīn; 2 October 971 – 30 April 1030), usually known as Mahmud of Ghazni or Mahmud Ghaznavi (محمود غزنوی), was Sultan of the Ghaznavid Empire, ruling from 998 to 1030. During his reign and in medieval sources, he is usually known by his honorific title Yamin al-Dawla (یمین‌ الدوله, lit. 'Right Hand of the State'). At the time of his death, his kingdom had been transformed into an extensive military empire, which extended from present-day northwestern Iran proper to the Punjab in the Indian subcontinent, Khwarazm in Transoxiana, and Makran.

Highly Persianized, Mahmud continued the bureaucratic, political, and cultural customs of his predecessors, the Samanids. He established the ground for a future Persianate state in Punjab, particularly centered on Lahore, a city he conquered. His capital of Ghazni evolved into a significant cultural, commercial, and intellectual centre in the Islamic world, almost rivalling the important city of Baghdad. The capital appealed to many prominent figures, such as al-Biruni and Ferdowsi.

The Ziyarid dynasty (Persian: زیاریان) was an Iranian dynasty of Gilaki origin that ruled Tabaristan from 931 to 1090 during the Iranian Intermezzo period. The empire rose to prominence during the leadership of Mardavij. After his death, his brother Vushmgir and his Samanid allies led the dynasty in wrestling for control over territory against the Buyids in the early- to mid-10th century. When Vushmgir died, his sons Bisutun and Qabus fought for influence. Qabus would eventually outlive his brother and ruled the kingdom. However, Qabus was placed in exile from 980 to 998 by the Buyid ruler, Adud al-Dawla who would then dominate Tabaristan, the heartland of Ziyarid power. A succession of other rulers came to rule the kingdom with Ghaznavid support in the early 11th century. The Nizari Ismaili state invaded and ended Ziyarid rule in 1090.

At its greatest extent, it ruled much of present-day western and northern Iran. During the turn of the century, the kingdom attracted many scholars, with the most notable being al-Biruni.

Islam is the dominant religion in Uzbekistan. Islamic customs were broadly adopted by the ruling elite, and they began patronage of scholars and conquerors such as Muhammad al-Bukhari, Al-Tirmidhi, Ismail Samani, al-Biruni, Avicenna, Tamerlane, Ulugh Begh, and Babur. Despite its predominance and history, the practice of Islam has been far from monolithic since the establishment of the Uzbek Soviet Socialist Republic.

The Muslim Board of Uzbekistan holds the Mushaf Othmani, the earliest existing copy of the Quran.

Beruniy (Uzbek: Beruniy/Беруний; Karakalpak: Biruniy/Бируний; Russian: Беруни) is a city in the autonomous republic of Karakalpakstan, Uzbekistan. It is located on the northern bank of the Amu Darya near Uzbekistan's border with Turkmenistan. The city is the seat of Beruniy District. Historically, Beruniy was known as Kath (Persian/Arabic: کاث; modern Uzbek: Kos) and served as the capital of Khwarazm during the Afrighid dynasty. In 1957, it was renamed "Beruniy" in honor of the medieval scholar and polymath Al-Biruni who was born here. Beruniy received city status in 1962.

Beruniy is an important industrial city in Karakalpakstan. It is home to an asphalt plant, a brick factory, a cotton plant, and a shoe factory. There are also many textile factories.